Fan and gas water heater

Abstract

The utility model belongs to the technical field of heat supply, and particularly discloses a draught fan and a gas water heater, the draught fan comprises a volute, a fixing shaft, a stator, an impeller and a rotor, the volute is provided with a containing cavity, one end of the volute is provided with a first opening, the side wall of the volute is provided with a second opening, and the first opening and the second opening are both communicated with the containing cavity. The fixing shaft is located in the containing cavity and fixedly connected with the volute, the stator surrounds the fixing shaft, the impeller rotationally sleeves the fixing shaft through the first opening, the rotor is arranged at the end, close to the stator, of the impeller, and the rotor and the stator are arranged at intervals in the axial direction of the fixing shaft to form a gap. According to the fan, a heat dissipation mechanism does not need to be additionally arranged, so that the small-sized design can be achieved, and meanwhile the good heat dissipation effect can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of heating, in particular to a fan and a gas water heater. Background Art

[0002] In order to supply sufficient oxygen to the gas water heater and avoid incomplete combustion of gas in the gas water heater and the production of carbon monoxide which is harmful to the human body, a fan is usually installed in the gas water heater to continuously supply air outside the gas water heater to the inside of the gas water heater.

[0003] During long-term operation of the fan, the motor part of the fan tends to generate a large amount of heat, causing local overheating of the motor and affecting the service life of the motor. Therefore, in the related technology, additional heat dissipation structures, such as heat sinks, heat conduction plates, etc., are usually set in the fan to improve the heat dissipation efficiency of the motor.

[0004] However, such an arrangement will result in a complex structure inside the fan, and the additional heat dissipation structure will occupy additional installation space, resulting in an increase in the size of the fan. Utility Model Content

[0005] One of the technical problems solved by the utility model is to provide a fan which can effectively solve the problem that the heat dissipation structure of the existing fan occupies additional installation space, resulting in an increase in the size of the fan, simplify the structure of the fan, and facilitate a smaller design.

[0006] The second technical problem solved by the utility model is to provide a gas water heater, which can effectively solve the problem that the existing gas water heaters are difficult to miniaturize due to the large size of the fan.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] A fan, comprising:

[0009] A volute, wherein the volute has a receiving cavity, a first opening is provided at one end of the volute, a second opening is provided on a side wall of the volute, and the first opening and the second opening are both connected to the receiving cavity;

[0010] A fixed shaft, the fixed shaft is located in the accommodating chamber and is fixedly connected to the volute;

[0011] A stator, the stator being arranged around the fixed shaft;

[0012] an impeller, the impeller being rotatably sleeved on the fixed shaft through the first opening; and

[0013] The rotor is arranged at one end of the impeller close to the stator, and the rotor and the stator are spaced apart from each other along the axial direction of the fixed shaft to form a gap.

[0014] Compared with the background technology, the fan described in the utility model has the following beneficial effects:

[0015] By setting up a stator and a rotor that cooperate with each other, when the stator is energized to cooperate with the rotor to drive the impeller to rotate around the fixed axis, the air flow can pass through the inner cavity of the impeller and the accommodating cavity in sequence and then flow to the second opening; since a gap is formed between the rotor and the stator, the gap is part of the accommodating cavity, and the second opening is not a structure surrounding the circumference of the volute, therefore, part of the air in the accommodating cavity needs to flow through the gap near the fixed axis in the accommodating cavity and then flow out to the second opening, that is, during the operation of the fan, there is always a part of the air that needs to pass through the gap and flow to the second opening, thereby improving the air exchange efficiency in the gap, so as to improve the heat dissipation efficiency of the rotor and stator located on two opposite sides of the gap, avoid heat accumulation in and near the rotor and stator of the motor constituting the fan, and there is no need to set up an additional heat dissipation structure, therefore, the structure of the fan is simple and a smaller design can be achieved.

[0016] In addition, by making the impeller rotatably sleeved on the fixed shaft, the fixed shaft can be prevented from rotating when the fan is running, thereby reducing the dynamic unbalance of the fan.

[0017] In one embodiment, a side of the stator facing the rotor is exposed to the gap, and / or a side of the rotor facing the stator is exposed to the gap.

[0018] In one embodiment, the volute is at least partially made of plastic, and the stator and the fixed shaft are both plastic-sealed and connected to the volute;

[0019] And / or, the impeller is made of plastic, and the rotor is plastic-sealed and connected to the impeller.

[0020] In one embodiment, the impeller has a mounting shaft hole extending through the fixed shaft in the axial direction, and the fan further includes a bearing, the bearing is disposed in the mounting shaft hole, and the inner ring of the bearing is fixedly sleeved on the fixed shaft.

[0021] In one of the embodiments, the volute further has an annular setting groove connected to the accommodating chamber, the annular setting groove surrounds the fixed shaft, and the stator is at least partially located in the annular setting groove.

[0022] In one embodiment, the stator includes a plurality of sub-cores arranged around the fixed shaft, each of the sub-cores is wound with a coil, and each of the sub-cores forms an N pole and an S pole on two opposite sides along the axial direction of the fixed shaft, and the positions of the N poles and the S poles of two adjacent sub-cores are opposite;

[0023] The rotor includes a plurality of sub-magnetic cores arranged around the fixed shaft, and any two adjacent sub-magnetic cores are connected.

[0024] In one embodiment, the sub-core includes a first part and a second part that are connected to each other, the second part is located on the side of the first part facing the rotor, any two adjacent first parts are connected, and any two adjacent second parts are spaced apart, a plurality of coils are wound one by one around the outer circumference of a plurality of second parts, and the coil part extends along the radial direction of the fixed axis.

[0025] In one embodiment, the impeller includes a central portion, a plurality of blades and an annular connecting portion, the central portion is rotatably mounted on the fixed shaft, the rotor is disposed at one end of the central portion close to the stator, the plurality of blades are arranged at intervals around the fixed shaft and connected to the central portion, the annular connecting portion is connected to a side of the plurality of blades away from the central portion in the axial direction of the fixed shaft, and the annular connecting portion can be rotatably inserted into the first opening.

[0026] In one embodiment, the first opening is a circular opening, and the annular connecting portion is rotatably connected to the first opening around the fixing shaft.

[0027] In one embodiment, the volute includes a first shell and a second shell that are detachably connected to each other, the fixed shaft and the stator are both connected to the first shell, the second opening is provided on the side wall of the first shell, and the first opening is provided on the second shell.

[0028] The above second technical problem is solved by the following technical solution:

[0029] A gas water heater comprises: a water heater shell and the fan as described above.

[0030] Compared with the background technology, the gas water heater described in the utility model has the following beneficial effects: by providing the fan as described above, it is possible to effectively solve the problem that the existing gas water heater is difficult to miniaturize due to the large size of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the structure of a fan provided in Embodiment 1 of the utility model;

[0032] Figure 2 for Figure 1 The structural cross-sectional schematic diagram of the fan shown in FIG.

[0033] Figure 3 for Figure 2 The structural exploded diagram of the fan shown in FIG.

[0034] Figure 4 A schematic three-dimensional diagram of the structure of the volute provided in the first embodiment of the utility model;

[0035] Figure 5 A schematic diagram of the structure of a stator provided in the first embodiment of the utility model;

[0036] Figure 6 A schematic diagram of the structure of a rotor provided in the first embodiment of the present invention;

[0037] Description of labels:

[0038] 100. Fan;

[0039] 1. volute; 10. accommodating chamber; 10a. gap; 11. first shell; 110. first opening; 12. second shell; 120. second opening; 120a. first end; 120b. second end; 1201. first plane; 1202. second plane; 13. annular setting groove;

[0040] 2. Fixed axis; 20. Central axis;

[0041] 3. stator; 30. sub-core; 301. first part; 302. second part; 31. coil;

[0042] 4. impeller; 40. center portion; 401. mounting shaft hole; 41. fan blade; 42. annular connecting portion;

[0043] 5. rotor; 50. sub-magnetic core;

[0044] 6. Bearings. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0047] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0048] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] like Figures 1 to 3 As shown, this embodiment provides a fan 100, including a volute 1, a fixed shaft 2, a stator 3, an impeller 4 and a rotor 5, the volute 1 has a accommodating chamber 10, one end of the volute 1 is provided with a first opening 110, the side wall of the volute 1 is provided with a second opening 120, the first opening 110 and the second opening 120 are both connected to the accommodating chamber 10, the fixed shaft 2 is located in the accommodating chamber 10 and is fixedly connected to the volute 1, the stator 3 is arranged around the fixed shaft 2, the impeller 4 is rotatably sleeved on the fixed shaft 2 through the first opening 110, the rotor 5 is arranged at one end of the impeller 4 close to the stator 3, and the rotor 5 and the stator 3 are spaced apart along the axial direction L of the fixed shaft 2 to form a gap 10a.

[0050] The gap 10a is formed by spacing the rotor 5 and the stator 3, and the gap 10a is part of the accommodating chamber 10, so that the stator 3 can be energized to cooperate with the rotor 5 to drive the impeller 4 to rotate around the fixed axis 2, so that the air flow passes through the inner cavity of the impeller 4 and the accommodating chamber 10 in sequence and then flows to the second opening 120. Since the second opening 120 is not a structure surrounding the circumference of the volute 1, in other words, since part of the outer periphery of the accommodating chamber 10 is closed by the volute 1, part of the air in the accommodating chamber 10 needs to flow through the gap 10a near the fixed shaft 2 in the accommodating chamber 10 and then flow out to the second opening 120. In other words, during the operation of the fan 100, there is always a part of the air that needs to pass through the gap 10a and flow to the second opening 120, thereby improving the air exchange efficiency in the gap 10a, so as to improve the heat dissipation efficiency of the rotor 5 and the stator 3 located on the two opposite sides of the gap 10a, avoid heat accumulation in and near the rotor 5 and the stator 3 of the motor constituting the fan 100, and there is no need to set up an additional heat dissipation structure. Therefore, the structure of the fan 100 is simple and a smaller design can be achieved.

[0051] In addition, by making the impeller 4 rotatably sleeved on the fixed shaft 2 , the fixed shaft 2 can be prevented from rotating when the fan 100 is running, thereby reducing the dynamic unbalance of the fan 100 .

[0052] Herein, “the impeller 4 is rotatably sleeved on the fixed shaft 2 through the first opening 110 ” specifically means that the impeller 4 at least partially enters the accommodating cavity 10 through the first opening 110 so as to be rotatably sleeved on the fixed shaft 2 .

[0053] In one embodiment, the side of the stator 3 facing the rotor 5 is exposed to the gap 10a, that is, the volute 1 is at least not connected to the side of the stator 3 facing the rotor 5, so that the stator 3 can directly exchange heat with the air in the gap 10a, and the heat dissipation efficiency of the stator 3 to the gap 10a is better.

[0054] In another embodiment, the side of the rotor 5 facing the stator 3 is exposed to the gap 10a, that is, the central portion 40 is at least not connected to the side of the rotor 5 facing the stator 3, so that the rotor 5 can directly exchange heat with the air in the gap 10a, and the heat dissipation efficiency of the rotor 5 to the gap 10a is better.

[0055] In a preferred embodiment, the side of the stator 3 facing the rotor 5 is exposed to the gap 10a, and the side of the rotor 5 facing the stator 3 is exposed to the gap 10a, so that the heat dissipation efficiency of the stator 3 and the rotor 5 to the gap 10a is good.

[0056] Please combine Figure 4As shown, along the direction surrounding the fixed shaft 2, the second opening 120 has a first end 120a and a second end 120b opposite to each other, and a plane passing through the first end 120a and the central axis 20 of the fixed shaft 2 is defined as a first plane 1201, and a plane passing through the second end 120b and the central axis 20 is defined as a second plane 1202. The first plane 1201 and the second plane 1202 form an angle θ. The larger the angle θ, the more liquid can flow directly from the accommodating chamber 10 to the outer periphery of the volute 1 to the second The more air there is in the opening 120, the less air needs to flow through the gap 10a to flow to the second opening 120. Therefore, the angle θ cannot be too large. However, if the angle θ is too small, the operating efficiency of the fan 100 will be limited. Therefore, the angle θ cannot be too small. Based on this, in one embodiment, the angle θ can satisfy: 30°≤θ≤50°. For example, the angle θ can be: 30°, 33°, 35°, 37°, 40°, 42°, 45°, 47° or 50°, etc.

[0057] In one embodiment, the volute 1 also has an annular setting groove 13 connected to the accommodating cavity 10, the annular setting groove 13 surrounds the fixed shaft 2, and the stator 3 is at least partially located in the annular setting groove 13, so that the position of the stator 3 on the volute 1 can be further limited by the groove wall of the annular setting groove 13, so that the relative position of the stator 3 with the volute 1 during use is more stable, thereby improving the reliability of the fan 100.

[0058] In one embodiment, the volute 1 includes a first shell 11 and a second shell 12 that are detachably connected to each other, the fixed shaft 2 and the stator 3 are both connected to the first shell 11, the second opening 120 is provided on the side wall of the first shell 11, and the first opening 110 is provided on the second shell 12, so that the accommodating chamber 10 can be exposed by disassembling the first shell 11 and the second shell 12, thereby facilitating the inspection and disassembly of the structure in the accommodating chamber 10.

[0059] In one embodiment, the first shell 11 may be a thin shell structure having a accommodating cavity 10, and the second shell 12 may be a thin plate structure. The second shell 12 covers the first shell 11 to cover part of the accommodating cavity 10, thereby making the structure of the second shell 12 simpler and easier to manufacture.

[0060] In one embodiment, the volute 1 is at least partially made of plastic material, and the stator 3 and the fixed shaft 2 are both plastic-sealed and connected to the volute 1. In other words, the volute 1 can be at least partially injection-molded on the outside of the stator 3 and the fixed shaft 2, so that on the one hand, the molding step of the volute 1 and the connecting step of the volute 1, the stator 3 and the fixed shaft 2 can be completed in the same process, so as to reduce the overall production process of the fan 100 and reduce the production cost, while reducing the number of detachable parts included in the fan 100 and improving the integration of the fan 100. On the other hand, the assembly accuracy of the volute 1, the stator 3 and the fixed shaft 2 can be higher, and no assembly gap will be generated, thereby reducing the dynamic imbalance of the fan 100, so as to reduce the vibration and noise generated when the fan 100 is working, and improve the reliability of the fan 100.

[0061] When the volute 1 includes the first shell 11 and the second shell 12 as described in the above embodiments, the stator 3 and the fixed shaft 2 can be both plastic-sealed and connected to the first shell 11 . In other words, the first shell 11 can be injection molded outside the stator 3 and the fixed shaft 2 .

[0062] When the side of the stator 3 facing the rotor 5 is exposed to the gap 10 a as described in the above embodiment, it can be understood that the volute 1 is not completely sealed to the stator 3 , that is, the volute 1 is at least not sealed and connected to the surface of the stator 3 facing the rotor 5 .

[0063] Preferably, at least the first shell 11 can be made of BMC (Bulk Molding Compound) material to utilize the characteristics of BMC's good structural strength, good heat resistance and high thermal conductivity, so that the first shell 11 can be thinner and lighter while having a structural strength that meets the requirements of use, and can be suitable for long-term contact with the stator 3 that generates heat during use, and can also improve the heat dissipation efficiency of the stator 3 to the first shell 11.

[0064] In another embodiment, the impeller 4 is made of plastic, and the rotor 5 is plastic-sealed and connected to the impeller 4. In other words, the impeller 4 is injection molded on the outside of the rotor 5 at the same time. Therefore, on the one hand, the molding step of the impeller 4 and the connection step of the impeller 4 and the rotor 5 can be completed in the same process, so as to reduce the overall production process of the fan 100 and reduce the production cost. At the same time, the number of detachable parts included in the fan 100 is reduced, and the integration of the fan 100 is improved. On the other hand, the assembly accuracy of the impeller 4 and the rotor 5 can be higher, and no assembly gap will be generated, thereby reducing the dynamic imbalance of the fan 100, so as to reduce the vibration and noise generated when the fan 100 is working, and improve the reliability of the fan 100.

[0065] Preferably, the impeller 4 can be made of BMC (Bulk Molding Compound) material to utilize the characteristics of BMC's good structural strength, good heat resistance and high thermal conductivity, so that the impeller 4 can be lighter and thinner while having a structural strength that meets the requirements of use, and can be suitable for long-term contact with the rotor 5 that generates heat during use, and can also improve the heat dissipation efficiency of the rotor 5 to the impeller 4.

[0066] When the side of the rotor 5 facing the stator 3 is exposed to the gap 10a as described in the above embodiment, it can be understood that the rotor 5 is not completely sealed to the impeller 4, that is, the impeller 4 is at least not plastic-sealed and connected to the surface of the rotor 5 facing the stator 3.

[0067] In a preferred embodiment, the stator 3 and the fixed shaft 2 can be plastic-sealed and connected to the volute 1, while the rotor 5 can be plastic-sealed and connected to the impeller 4, so that the overall production process of the fan 100 is fewer, and the dynamic imbalance of the fan 100 is smaller, so that the vibration and noise generated when the fan 100 is working are smaller, and the reliability of the fan 100 is better.

[0068] In one embodiment, the impeller 4 has a mounting shaft hole 401 that passes through the fixed shaft 2 in the axial direction L. The fan 100 also includes a bearing 6, which is arranged in the mounting shaft hole 401. The inner ring of the bearing 6 is fixedly sleeved on the fixed shaft 2. Therefore, when the impeller 4 rotates relative to the fixed shaft 2, the friction between the center portion 40 and the fixed shaft 2 is small, which can reduce the heat generated by friction between the impeller 4 and the fixed shaft 2.

[0069] When the impeller 4 is made of plastic as described in the aforementioned technical solution, preferably, the outer ring part can be plastic-sealed and connected to the impeller 4. In other words, the impeller 4 can also be injection molded on the outside of the outer ring, thereby further reducing the production process of the fan 100 and further reducing the dynamic imbalance of the fan 100, so as to further reduce the vibration and noise generated when the fan 100 is working, and improve the reliability of the fan 100.

[0070] like Figure 3As shown, in one embodiment, the impeller 4 includes a central portion 40, a plurality of blades 41 and an annular connecting portion 42. The central portion 40 is rotatably sleeved on the fixed shaft 2, and the rotor 5 is disposed at one end of the central portion 40 close to the stator 3. The plurality of blades 41 are arranged at intervals around the fixed shaft 2 and connected to the central portion 40. The annular connecting portion 42 is connected to one side of the plurality of blades 41 away from the central portion 40 along the axial direction L of the fixed shaft 2. The annular connecting portion 42 can be rotatably inserted into the first opening 110, so that the annular connecting portion 42 and the central portion 40 can be respectively connected to two opposite sides of the plurality of blades 41 along the axial direction L of the fixed shaft 2, thereby making the relative position relationship of the plurality of blades 41 more stable, so that the overall structural stability of the impeller 4 is better, and the air extraction stability of the impeller 4 is also better.

[0071] When the impeller 4 has the mounting shaft hole 401 as described in the above embodiments, the mounting shaft hole 401 is provided in the central portion 40 .

[0072] In one embodiment, the first opening 110 is a circular opening, and the annular connecting portion 42 is rotatably connected to the first opening 110 around the fixed shaft 2. Therefore, on the one hand, the first opening 110 can limit the annular connecting portion 42, so that the posture stability of the annular connecting portion 42 when rotating relative to the fixed shaft 2 is better, thereby making the reliability of the exhaust effect of the fan blade 41 better. On the other hand, it can also make the gap between the groove wall of the first opening 110 and the annular connecting portion 42 smaller, thereby reducing the leakage of air in the accommodating chamber 10 from the gap between the groove wall of the first opening 110 and the annular connecting portion 42.

[0073] Please combine Figure 5 and Figure 6 As shown, in one embodiment, the stator 3 includes a plurality of sub-cores 30 arranged around the fixed shaft 2, and a coil 31 is wound around each sub-core 30, so that by energizing the coil 31, each sub-core 30 can form an N pole and an S pole on two opposite sides along the axial direction L of the fixed shaft 2, and the positions of the N pole and the S pole of two adjacent sub-cores 30 are opposite.

[0074] In one embodiment, the sub-core 30 includes a first part 301 and a second part 302 connected to each other, the second part 302 is located on the side of the first part 301 facing the rotor 5, any two adjacent first parts 301 are connected, and any two adjacent second parts 302 are spaced apart, and a plurality of coils 31 are wound one by one around the outer circumference of the plurality of second parts 302, and the coil 31 portion extends along the radial direction of the fixed shaft 2.

[0075] Specifically, one of the first part 301 and the second part 302 forms an N pole, and the other forms an S pole, and the polarities of any two adjacent first parts 301 are opposite, and the polarities of any two adjacent second parts 302 are also opposite.

[0076] At the same time, the rotor 5 includes a plurality of sub-cores 50 arranged around the fixed shaft 2, and any two adjacent sub-cores 50 are connected, so that when the coil 31 is energized, the rotor 5 can rotate around the fixed shaft 2 under the action of the magnetic field of the stator 3. Specifically, each sub-core 50 forms an N pole and an S pole on two opposite sides along the axial direction L of the fixed shaft 2, and the positions of the N poles and the S poles of two adjacent sub-cores 50 are opposite. In order to facilitate understanding of the magnetic pole situation of the rotor 5, Figure 6 Dashed lines are used to divide the N-pole part and the S-pole part of the sub-core 50, and the part forming the N-pole is filled with a dot matrix pattern, while the part forming the S-pole is not filled with a pattern. It can be understood that the dashed line is only used to provide an example of the division position of the N-pole part and the S-pole part, and the filling pattern is only used to distinguish the N-pole part from the S-pole part, so as to facilitate observation of the approximate position of the N-pole part and the S-pole part. The dashed line and the filling pattern do not constitute a specific limitation on the actual structure of the rotor 5.

[0077] In one embodiment, the number of sub-cores 30 and sub-magnetic cores 50 may be equal or unequal. When the number of sub-cores 30 and sub-magnetic cores 50 is equal, when the fan 100 stops working, the sub-cores 30 and sub-magnetic cores 50 may correspond one to one.

[0078] When the number of sub-iron cores 30 and sub-magnetic cores 50 is not equal, the number of poles of the rotor 5 is not equal to the number of poles of the stator 3. The number of poles of the rotor 5 and the stator 3 can be more flexibly adjusted according to the use design requirements to further improve the driving efficiency of the stator 3 being energized to cooperate with the rotor 5 to drive the impeller 4 to rotate. Figure 5 and Figure 6 As shown in Figure 5 FIG. 4 shows by way of example that the stator 3 includes six sub-cores 30. Figure 6 exemplarily shows that the rotor 5 includes eight sub-cores 50 .

[0079] The present embodiment also provides a gas water heater, comprising: a water heater housing and a fan 100 as described in the aforementioned technical solution. By setting the fan 100 as described above, it is possible to effectively solve the problem of local overheating of the fan 100 while making the volume of the fan 100 smaller, thereby solving the problem that the existing gas water heater is difficult to miniaturize due to the large volume of the fan 100.

[0080] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The specific contents of the above specific implementations only express several implementations of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A fan, characterized in that: include: A volute (1), the volute (1) having a receiving chamber (10), one end of the volute (1) being provided with a first opening (110), a side wall of the volute (1) being provided with a second opening (120), the first opening (110) and the second opening (120) both being in communication with the receiving chamber (10); A fixed shaft (2), the fixed shaft (2) being located in the accommodating chamber (10) and fixedly connected to the volute (1); A stator (3), the stator (3) being arranged around the fixed shaft (2); an impeller (4), the impeller (4) being rotatably sleeved on the fixed shaft (2) through the first opening (110); and A rotor (5), wherein the rotor (5) is arranged at one end of the impeller (4) close to the stator (3), and the rotor (5) and the stator (3) are spaced apart along the axial direction of the fixed shaft (2) to form a gap (10a).

2. The fan according to claim 1, characterized in that: The side of the stator (3) facing the rotor (5) is exposed to the gap (10a), and / or the side of the rotor (5) facing the stator (3) is exposed to the gap (10a).

3. The fan according to claim 1, characterized in that: The volute (1) is at least partially made of plastic material, and the stator (3) and the fixed shaft (2) are both plastic-sealed in the volute (1); And / or, the impeller (4) is made of plastic, and the rotor (5) is plastic-sealed in the impeller (4).

4. The fan according to claim 1, characterized in that: The impeller (4) has a mounting shaft hole (401) that passes through the fixed shaft (2) in the axial direction. The fan (100) further comprises a bearing (6). The bearing (6) is arranged in the mounting shaft hole (401). The inner ring of the bearing (6) is fixedly sleeved on the fixed shaft (2).

5. The fan according to claim 1, characterized in that: The volute (1) further comprises an annular setting groove (13) connected to the accommodating chamber (10), the annular setting groove (13) surrounds the fixed shaft (2), and the stator (3) is at least partially located in the annular setting groove (13).

6. The fan according to any one of claims 1 to 5, characterized in that: The stator (3) comprises a plurality of sub-iron cores (30) arranged around the fixed shaft (2), each of the sub-iron cores (30) being wound with a coil (31), each of the sub-iron cores (30) forming an N pole and an S pole respectively on two opposite sides along the axial direction of the fixed shaft (2), and the positions of the N poles and the S poles of two adjacent sub-iron cores (30) being opposite; The rotor (5) comprises a plurality of sub-magnetic cores (50) arranged around the fixed shaft (2), and any two adjacent sub-magnetic cores (50) are connected.

7. The fan according to claim 6, characterized in that: The sub-core (30) comprises a first part (301) and a second part (302) which are connected to each other, wherein the second part (302) is located on a side of the first part (301) facing the rotor (5), any two adjacent first parts (301) are connected, and any two adjacent second parts (302) are spaced apart, and a plurality of coils (31) are wound around the outer circumferences of the plurality of second parts (302) in a one-to-one correspondence, and the coil (31) portion extends along the radial direction of the fixed shaft (2).

8. The fan according to any one of claims 1 to 5, characterized in that: The impeller (4) comprises a central portion (40), a plurality of blades (41) and an annular connecting portion (42); the central portion (40) is rotatably sleeved on the fixed shaft (2); the rotor (5) is arranged at one end of the central portion (40) close to the stator (3); the plurality of blades (41) are arranged at intervals around the fixed shaft (2) and connected to the central portion (40); the annular connecting portion (42) is connected to one end of all the blades (41); and the annular connecting portion (42) is rotatably inserted into the first opening (110).

9. The fan according to any one of claims 1 to 5, characterized in that: The volute (1) comprises a first shell (11) and a second shell (12) which are detachably connected to each other, the fixed shaft (2) and the stator (3) are both connected to the first shell (11), the second opening (120) is provided on the side wall of the first shell (11), and the first opening (110) is provided on the second shell (12).

10. A gas water heater, characterized in that: include: A water heater housing and a fan (100) as claimed in any one of claims 1 to 9.

Images